Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent
1995-06-07
1998-03-03
Tran, Sinh
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
381108, H04R 7500
Patent
active
057244332
ABSTRACT:
Adaptive compressive gain and level dependent spectral shaping circuitry for a hearing aid include a microphone to produce an input signal and a plurality of channels connected to a common circuit output. Each channel has a preset frequency response. Each channel includes a filter with a preset frequency response to receive the input signal and to produce a filtered signal, a channel amplifier to amplify the filtered signal to produce a channel output signal, a threshold register to establish a channel threshold level, and a gain circuit. The gain circuit increases the gain of the channel amplifier when the channel output signal falls below the channel threshold level and decreases the gain of the channel amplifier when the channel output signal rises above the channel threshold level. A transducer produces sound in response to the signal passed by the common circuit output.
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Engebretson A. Maynard
O'Connell Michael P.
K/S HIMPP
Tran Sinh
LandOfFree
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